More like Best to less-best and one dud. My full reviews of each album are available under my same name at metal archives. Feel free to message me with what you think. My full reviews below:
Mardraum
Blodhemn
Isa
Frost
RUUN
Axioma
VV
In Times
RIITIIR
Monumension
Eld
BTL
Vertebrae

The first era consists of the first three albums, namely Vikingligr Veldi (1994), Frost (1994) and Eld (1997). All these albums are important releases in Viking Metal's history and they have defined some musical aspects for the whole genre.

This is not a typical "Best of the decade" list. To be more precise, it's a list about the top 20 albums of each year of the last decade (the ones in MS), in my perspective of course. In this way, a lot of good albeit overlooked albums can get some exposure, in addition to covering more ground at the same time.